Backup Battery Charger for iPhone 3G/3GS & iPhone 4-Black

Applied to iPhone 3G/3Gs & 4GWithin 3 seconds after plugged into the power station, the iphone/ipod will show charging state."CAPACITY"--4 LEDs at top-left: flash when charging the mobile, no flash when the power lower than 2.8V;show the battery capacity when the the button on the upper right pressed; flash one by one from left to right when itself charged.Charged via the computer or AC adapter with the USB cable."FULL"--LED downside: light after itself charged full.Can be fully charged about 2 hours.Portable size, easy to carry.